Week 2

Question 1

What is a value

Answer 1

A number or string that can be stored in a variable or computed in an expression.

Question 2

What is an object

Answer 2

Something that can be used. i.e. kez = turtle.Turtle(). kez is an object and that object has all of the method and attributes associated with the class turtle.

Question 3

What are classes

Answer 3

define objects (i.e car is an object of the class vehicles)
Classes are a group of objects (i.e. turtle is a class and within that class are held all the methods and attributes associated with the class turtle, i.e. all the things it can do).

Question 4

What function would you use to change one type to a different type?

Answer 4

int( to change it to whole numbers)
str( to change it to a string)
float(to change it to decimal point numbers)

Question 5

What is a variable

Answer 5

A name that refers to a value

Question 6

What does an assignment statement do

Answer 6

Creates a new variable and gives it a name.

Question 7

What is the assignment token/operator

Answer 7

=

Question 8

What is illegal in a variable name

Answer 8

It can’t start with a number, but digits can be in the name.
Can not be any of the keywords.
Can not have any white space, but can contain _
For convention purposes programmers generally use lower case.

Question 9

What is a statement

Answer 9

It is an instruction that python can interpret and execute.

Example: while, for, if and import

Question 10

What is an expression

Answer 10

Combination of values, variables & operators.

Expressions need to be executed.

Question 11

What does the len() function do

Answer 11

returns the number of characters in the string.

Question 12

What is an operator

Answer 12

They are special tokens that represent computation.

Example: + - * / ** // %

Question 13

What does the operator // do?

Answer 13

It is called an integer division. divides and then rounds down to the nearest integer.

Question 14

What does the operator % do?

Answer 14

The modulus operator or remainder. After dividing it will return the value of the integer remaining.
Example: 11/4 = 2.75. 11%4 = 3 (11-8)

Question 15

What does the input() function do?

Answer 15

It asks the user what value they want to use.

The answer from the users will always in a string.

Question 16

What is the order or operation or operator precedence?

Answer 16

first - ()
second - **
third - * & /
forth - + & -

Order of precedence goes from left to right.
Except ** which goes right to left.

Question 17

What does reassignment do?

Answer 17

It gives a new reference/value to the variable

Question 18

What is imperative programming. And what are the 5 types of imperative programming.

Answer 18

Imperative programming changes the state of the program.
5 imperative programming:
   Sequence
   Selection or Conditional
   Iteration or Repetition
   Abstraction
   Data

Question 19

What is a sequence, what does it mean?

Answer 19

It mean one line is executed than the next, than the next.